Graduate Pharmacy Aptitude Test (GPAT) 2011 Solved Paper

Question : 110 of 150

Marks: +1, -0

. Five-membered heteroaromatic compounds show a much higher rate of electrophilic aromatic substitutionreactions than the six-membered ones. This is due to which one of the following reasons?

Five-membered heteroaromatic compounds have higher circulating electron density in the ring than the six-membered ones
Five-membered heteroaromatic compounds have lower circulating electron density in the ring than the six-membered ones
Five-membered rings are smaller in size than the six membered ones which affects their reaction rates
Six membered heteroaromatic rings are flat while the five-membered ones are puckered

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